an attribute named "javax.servlet.request.cipher_suite" of type
String.

an attribute named "javax.servlet.request.key_size" of type Integer.

an attribute named "javax.servlet.request.X509Certificate" of type
java.security.cert.X509Certificate[]. This is an array of objects of type
X509Certificate, the order of this array is defined as being in ascending
order of trust. The first certificate in the chain is the one set by the
client, the next is the one used to authenticate the first, and so on.